"There is an old Danish doctor still going the rounds who became a leprologist late in life. By accident. He was excavating an ancient cemetery and found skeletons there without fingerbones -- it was an old leper-cemetery of the fourteenth century. He X-rayed the skeletons and he made discoveries in the bones, especially in the nasal area, which were quite unknown to any of us -- you see most of us haven't the chance to work with skeletons. He became a leprologist after that. You will meet him at any international conference on leprosy carrying his skull with him in an airline's overnight bag. It has passed through a lot of douaniers' hands. It must be rather a shock, that skull, to them, but I believe they don't charge duty on it."
The Danish expert was of course Vilhelm Møller-Christensen, and the story is more-or-less true, though a lot of the time he was passing through customs with a whole string-bag of skulls, not just one.